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08_InstSolManual_PDF_Part20

# 08_InstSolManual_PDF_Part20 - 55.2 J v water 5 1 m squid m...

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Solve: gives and The total kinetic energy after the decay is Thus, 8.71. Set Up: Let be to the right. and Solve: gives The sleigh’s velocity is to the left. Reflect: The vertical component of the momentum of the system consisting of the two people and the sleigh is not conserved, because of the net force exerted on the sleigh by the ice while they jump. 8.72. Set Up: The bat is sketched in Figure 8.72. The mass of the bat is 0.878 kg. The small weight has mass 1.53 kg. Use coordinates with origin at the handle of the bat and the x axis along the bat. Let the small weight be a distance x from the origin. We require that Figure 8.72 Solve: and 8.73. Set Up: Use coordinates where is in the direction the squid moves. Take the system to be the squid plus the water it expels. After it expels the water the squid has mass Solve: (a) gives (b) The initial kinetic energy of the system is zero. The final kinetic energy is This kinetic energy is produced by action of the squid. 1 2 1 1.75 kg 21 6.79 m / s 2 2 1 1 2 1 4.75 kg 21 2.50 m / s 2 2 5 55.2 J.
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Unformatted text preview: 55.2 J. v water 5 1 m squid m water 2 v squid 5 1 4.75 kg 1.75 kg 2 1 2.50 m / s 2 5 6.79 m / s 5 m squid v squid 2 m water v water P i, x 5 P f, x m squid 5 4.75 kg. 1 x x 5 10.5 in. x cm 5 1 1.53 kg 2 x 1 1 0.878 kg 21 25.5 in. 2 1 1 0.150 kg 21 34.0 in. 2 1.53 kg 1 0.878 kg 1 0.150 kg 5 17.0 in. 17.0in. 25.5in. 34.0in. wire 150g cm bat y x x cm 5 17.0 in. 0.105 m / s, v C , f, x 5 1 800 N 21 2 3 5.00 m / s 4 cos 30.0° 2 1 1 600 N 21 1 3 7.00 m / s 4 cos 36.9° 2 1000 N 5 2 0.105 m / s v C , f, x 5 m A v A , f, x 1 m B v B , f, x m C 5 w A v A , f, x 1 w B v B , f, x w C . 5 m A v A , f, x 1 m B v B , f, x 1 m C v C , f, x . P i, x 5 P f, x w C 5 1000 N. w B 5 600 N w A 5 800 N, 1 x K p K tot 5 1 1 1 m p / m e 5 1 1 1 1836 5 5.44 3 10 2 4 5 0.0544%. K tot 5 1 2 m e v e 2 1 1 2 m p v p 2 5 1 2 m e 1 m p m e 2 2 v p 2 1 1 2 m p v p 2 5 1 2 m p v p 2 1 1 1 m p m e 2 . v e 5 1 m p m e 2 v p . 5 m p v p 2 m e v e P i, x 5 P f, x 8-20 Chapter 8...
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